Electronic Control Module (ECM): Precautions

When certain materials rub together, a transfer of electrons from one material to another may occur. This results in an electrostatic charge (static electricity) being built up in one of the materials. Since electronic components used in control systems are designed to carry very low voltages, as little as a 30-volt charge created by static electricity can cause a total or degrading failure in ECM or other electronic components. Before servicing ECM, ground yourself and ground the work area to discharge stored electricity.